Use more references in ContainerNode code

Source/core/html/parser/HTMLConstructionSite.cpp

Index: Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/Source/core/html/parser/HTMLConstructionSite.cpp b/Source/core/html/parser/HTMLConstructionSite.cpp
index 46c6faf616dc18a9a3e56b880b6d67781aadd675..f0ac5ad2b35da009a18d4e4782d52e93480c9c89 100644
--- a/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -102,7 +102,7 @@ static inline void insert(HTMLConstructionSiteTask& task)
         parent->parserRemoveChild(*task.child);
 
     if (task.nextChild)
-        task.parent->parserInsertBefore(task.child.get(), task.nextChild.get());
+        task.parent->parserInsertBefore(task.child.get(), *task.nextChild);
     else
         task.parent->parserAppendChild(task.child.get());
 }
@@ -140,7 +140,7 @@ static inline void executeTakeAllChildrenTask(HTMLConstructionSiteTask& task)
 {
     ASSERT(task.operation == HTMLConstructionSiteTask::TakeAllChildren);
 
-    task.parent->parserTakeAllChildrenFrom(task.oldParent());
+    task.parent->parserTakeAllChildrenFrom(*task.oldParent());
 }
 
 void HTMLConstructionSite::executeTask(HTMLConstructionSiteTask& task)